How to spot a fake: basics of artwork authentication

Spotting a fake comes down to checking three things in order: the object itself, its documented history, and the credibility of whoever is selling it. No single one of these settles the question, but together they make a forgery very hard to sustain. The honest headline is that confident authentication of a valuable work is a specialist job, yet most of the judgement that protects an ordinary buyer is plain common sense applied calmly, before any money changes hands.

What does authentication actually mean?

Authentication is the process of establishing that a work was genuinely made by the artist it is attributed to, rather than copied, faked, or wrongly assigned. It is not one test but a weighing of evidence from several directions. Connoisseurship, meaning a trained eye comparing the work to others by the same hand, sits alongside the paper trail of ownership and, for higher-value pieces, scientific analysis of materials. A claim survives when these lines of evidence agree and falls apart when they contradict each other. Think of yourself as building a case, not flipping a switch.

How do you read the object itself?

Start with the physical work, because a forgery has to get the materials and the making right, and often doesn’t. Look at whether the medium, support and age are consistent with the claim: a “1950s” oil on a suspiciously modern canvas board, or a print whose paper feels wrong for its supposed date, should give you pause. Examine the back as carefully as the front, since labels, stamps, inventory numbers and old framing tell a story that is awkward to fake convincingly. For prints and editions, check how the image sits on the paper and whether the edition numbering looks consistent with how that artist actually worked.

Forgers are good at faking the picture. They are far worse at faking the wear, the reverse, and the history.

A signature deserves particular scepticism. It is the detail buyers fixate on and the one forgers find easiest to imitate, so a confident-looking signature proves remarkably little on its own. Weigh it as one small piece of the picture rather than the clincher.

Why provenance matters more than the picture

Provenance, the documented chain of who has owned a work since it was made, is usually stronger evidence than your eye alone. A forger can paint a convincing surface, but inventing a credible, checkable history of invoices, exhibition catalogues and saleroom records is far harder, because each link can be cross-referenced against the public record. This is why a vague “from a private collection” with no names or dates should slow you down, while a history you can actually trace gives real reassurance. We have written separately on what provenance is and why it matters when buying and on what certificates of authenticity actually mean; both are worth reading before a significant purchase. Treat strong provenance as a powerful indicator and missing provenance as a question to ask, not an automatic verdict either way.

When should you bring in technical analysis?

Technical analysis becomes worthwhile when the sum at stake justifies its cost, typically for older or higher-value works on the secondary market. Specialists can examine a painting under ultraviolet and infrared light to reveal later overpainting or underdrawing, analyse pigments and binders for anachronisms, and study the canvas or panel for age. None of this is needed for a modestly priced print from a living artist’s own gallery. It comes into its own precisely where forgery pays, which is around famous names and large figures. If a seller of an expensive work resists letting an independent expert examine it, that reluctance is itself a piece of evidence.

How does the seller change the risk?

Who is selling a work changes your risk profile more than almost anything else, because a reputable dealer has already done much of the checking and stakes their name on it. An established gallery cannot afford to handle fakes, will expect provenance questions, and answers them properly rather than bristling. A specialist such as Alon Zakaim Fine Art or Bernard Jacobson Gallery, both long-standing London dealers, treats those questions as routine. The riskier the channel, the more the burden of proof shifts onto you: an anonymous online listing, a too-cheap “estate clearance”, or a private seller who is evasive about origins all demand the scrutiny that a credible gallery has already absorbed.

What are the practical red flags?

The clearest warning sign is a deal that is too good to be true paired with a story that won’t bear weight. A bargain price for a sought-after name, a seller in a hurry, vague answers about where the work came from, a glossy certificate offered as the sole proof, or pressure to decide quickly are all reasons to step back. Ask plainly for the provenance in writing, request a precise dated invoice, and take the time to verify what you can against auction databases and any catalogue raisonné. Most fakes don’t survive patient, polite questions. The single best protection is to slow down, buy from people whose reputation depends on being right, and never let enthusiasm outrun the evidence.